Your Outlook Safe Senders list is full. Mail you need is landing in Junk. Here's the fix.
Built by an operator who took his own Safe Senders list from 1,940 entries down to 739 — with every change reviewed first, and an undo script for pruning included.
See pricing →Works with
The fix runs where the Safe Senders list actually lives — on your Exchange Online mailbox, server-side. It works identically no matter which Outlook you open.
Who this is for
You're your own admin
You manage your own Microsoft 365 mailbox and you've hit the wall yourself. You want it fixed without hand-editing a list for an hour.
You're a consultant or fractional IT
You manage a handful of small-business tenants and this is a recurring client complaint. One license, every client mailbox you administer.
You're internal IT
An executive mailbox auto-added every contact for a decade and now legitimate mail is landing in Junk. You need this fixed cleanly, with a paper trail.
How it works
This sequence is the whole point. Nothing is destructive until you say so.
Snapshot
Your current Safe Senders list is pulled read-only. Nothing changes yet — this is your record of the before state.
Plan
Computed entirely offline: what would be consolidated, what would be pruned, and why. No mailbox access during planning.
Your approval
The plan prints in full. You read it. You type "apply" — or you don't, and nothing happens.
Apply
A dry run prints exactly what will change first, then it applies for real — an incremental add/remove, never a full-list wipe.
Restore-anytime
Every run is archived with a full audit trail. Recency Prune removals can be undone later, from any run, at any time.
What's in the box
- Consolidation tool — dedupe + domain promotion
- Recency Prune tool — remove entries you haven't corresponded with
- Restore script — undo any Recency Prune removal, any time, from its audit record
- Full runbook — quick start, both tools, configuration reference
- FAQ, troubleshooting, and supported-configuration docs
- 12 months of updates — bug fixes and re-validation as Microsoft's APIs shift
Requirements
This is a PowerShell toolkit you run yourself — not an add-in, not an installer, not a service that needs your credentials.
- Windows 10 or 11
- PowerShell 7.4 or later
- The ExchangeOnlineManagement PowerShell module (both tools)
- Microsoft.Graph.Authentication, Microsoft.Graph.Mail, and Microsoft.Graph.Users modules (Recency Prune only)
- Your own mailbox, or one you administer (Mail Recipients / User Options role)
Pricing
One-time purchase. No license key, no phone-home check, no DRM — honor-based, plainly stated.
Personal
Your own mailbox, or any mailbox you administer within one organization.
- Both tools — consolidate + recency prune
- Restore script + full audit trail
- 12 months of updates
- No subscription, ever
Consultant
Everything in Personal, plus use across every client tenant you administer.
- Everything in Personal
- Unlimited client tenants
- 12 months of updates
- No subscription, ever
14-day guarantee
If it's not right for you, email team@outlooksafelist.com within 14 days for a full refund. No questions asked, no hoops.
Frequently asked questions
Why is my Safe Senders list full?
Microsoft caps the combined Safe Senders / Blocked Senders / Safe Recipients list at 510 KB — roughly 1,000–1,024 entries depending on length. Past that ceiling, new entries silently fail to save. The list accretes over years of one-off adds; almost nobody prunes it.
What is the Safe Senders limit in Microsoft 365?
510 KB combined across Safe Senders, Blocked Senders, and Safe Recipients — in practice, roughly 1,000–1,024 entries. (A separate, unrelated feature — tenant-level anti-spam allow lists in the Defender portal — caps manual entry at 30 at a time. That's not this list; don't confuse the two.)
Does this work with the new Outlook?
Yes. The Safe Senders list lives server-side on your Exchange Online mailbox — classic Outlook, new Outlook, Outlook on the web, and mobile all read and write the same list. This toolkit talks to that list directly; it never touches any Outlook client.
Will this break my email?
Nothing applies without your explicit approval. Every run snapshots before and after, diffs the result, and shows you the plan before touching anything. Recency Prune removals are additionally reversible via the included restore script, any time, from that run's audit record.
Can't I just do this by hand?
For a small list, yes — add and remove one at a time in Outlook on the web. This toolkit is for lists in the hundreds, where finding redundant domain entries or figuring out who you haven't emailed in 18 months isn't something you can eyeball.
Do I need admin rights or IT approval?
Against your own mailbox, no — default permissions cover it. Against a mailbox you administer but don't own, you need the Mail Recipients or User Options role in that tenant.
Is this a subscription?
No. One-time purchase, either tier. You get 12 months of updates included; after that, the version you have keeps working — you just won't get further updates without renewing.